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Paint Printing Adhesive Development And The Status Quo
- Jun 16, 2017 -

The 1950s, the rapid rise of petrochemical and polymer science, gave birth to a wide range of synthetic Printing Adhesive. For the traditional dyeing process complex, defective products, high cost and long processing cycle and other shortcomings, the rise of foreign paint dyeing and printing.

From the improvement of fastness, improve the feel, reduce energy consumption and other direction of development, foreign adhesives mainly through four stages: the first generation of adhesives can not cross-linked polymer film material. The second generation of the addition of -CN, -OH, -NH2, -COOH and other active groups of the adhesive; the third generation is in the binder component by adding self-crosslinking monomer to improve the fastness, Baking temperature, shorten the baking time. Due to the high energy consumption of high temperature baking, the fourth generation of printing adhesive - low temperature crosslinking adhesives soon appeared. Its cross-linking agent molecular structure with a strong active group, can be about 100 degrees Celsius with hydroxyl or amino reaction, can improve the film's fastness to wear, but also significant savings in energy consumption.

In improving the application performance of adhesives and explore new synthetic technology, the domestic also made a lot of research. Such as the use of special macromolecule low-temperature crosslinking monomer for soap-free emulsion polymerization, soft and low temperature integrated self-crosslinking adhesive SLP-801, improved the feel of the printed matter; in the binder molecules into the silicone The use of N, N-methylene bisacrylamide as the crosslinking component, developed a multi-functional coating printing adhesive MF, with a set of bonding, by adding, to improve the wear and wash fastness of the film; Thick, self-crosslinking as one of the characteristics. In the synthesis process, the emergence of a soft monomer for the core, hard monomer shell for the adhesive, so that when the printing to reduce the blocking network, but the real shell is not much nuclear.

Acrylic Coatings Adhesive Synthesis Technology

The quality of the printing product is directly affected by the performance of the printing adhesive. China's paint printing process research began in the late 50's, the current synthesis of the adhesive using emulsion polymerization process.

Compared with other polymerization methods, emulsion method has many advantages, such as low viscosity, easy to heat, with high polymerization rate, can produce high molecular weight polymer; water as the medium, production safety, environmental pollution, cost low. These valuable features give the emulsion polymerization method with strong vitality.

PA (acrylic) resin or finishing agent is a variety of acrylic monomer and other various hard monomers, soft monomer, functional monomer, crosslinking monomer and the necessary additives such as copolymerization. Add emulsifiers, initiators and other additives when combined. PA product performance is mainly composed of monomer components when the composition ratio, emulsifier initiator varieties and concentrations to determine the conditions, the polymerization method and feeding method is also a key factor.

The polymerization process is mainly carried out by the addition of the monomer, added in batches or continuously. The feeding method is all mixed by the monomer, partially mixed or monomer added step by step. According to the experiment, the polymerization method is easy to control in batch or continuous dropping process, the product tensile strength is also good, the feeding method has three kinds of use, the performance has its own advantages and disadvantages, to be determined by the product requirements. The aggregation method and the feeding method have different nucleation and growth of PA products, and the size, shape, structure and performance of the particles are different. In recent years, domestic and foreign research work in this area more, and has made progress, is to improve PA performance in the future one of the important content.